Handle for pneumatic tools



Nov. 13, 1928. 1 1,691,720

F. A. Jl ER INVENTOR.

Ezm 2 HIS ATTRNEY Patented Nov. 13, 1928.

UNITED STATES PATENT OFFICE.

FRANCIS A. JIMERSON, OF ATHENS, PENNSYLVANIA, ASSIGNOE TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW EB-SEY.

HANDLE FOR PNEUMATIC TOOLS.

Application filed November 24, 1826. Serial No. 150,495.

This invention relates to percussive tools but more particularly to a .device for securing of handle and back head to the toolcylinder.

. 5 One object of this invention is to enable the back head of the tool to be held securely in place with respect to the cylinder during the operation of the tool.

Further objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the features of construction and the combination of elements substantially as hereinafter described and more particularly pointed out in the 5 appended claim and illustrated in the accompanying drawing, in which Figure 1 is a longitudinal partial sectional elevation of a pneumatic hammer tool constructed in accordance with the practiceof the invention, 7

Figure 2 is a plan view in section taken on the line 2-2 of Fig. 1 looking in the direction of the arrows, and

Figure 3 is a perspective View of one of the bolts used to secure the back head and handle to the cylinder. 7

Referring to the drawing, A is the cylinder of a pneumatic hammer tool having a back head B and a handle portion C. The cylinder A is provided with a reciprocating hammer piston D by means of which blows of impact are delivered to the drill steel or tool (not shown). A handle E is provided with a throttle lever F which controls the admission of motive fluid to a passage G.

In the back head B, a valve chamber H is formed housing a reciprocating valve J. A

passage K leads from the valve chamber H to conduct pressure fluid to the front end of the cylinder A and a passage L conducts pressure fluid to the rear end of the cylinder A. Intermediate the front and rear ends of the cylinder A an exhaust port 0 leads to the atmosphere and the port P is located intermediate the exhaust port 0 and therear end of the cylinder A.

. A raised cylindrical ortion Q, is provided on the front face of the back head B fitting closely into the rear end ofthe cylinder bore A.

der A in the recesses Y. These hooked por tions are similar to the hooked ends U of the bolts S.

In assembling the tool the back head B is so placed that the raised cylindrical portion Q fits the cylinder bore A.- The bolts S are then placed so that the hooks U en.-

gage the hooks X on the cylinder A and are held in place by hand until the portion 0 is brought into position and the bolts S passed through the lugs R. Lock washers Z are then placed over the ends of the bolts 7 S and the nuts Z) screwed firmly into place thus securing the handle C, back head B and cylinderA rigidly in position relative to each other.

I claim In apneumatic tool, the combination of a cylinder, a back head forming a closure for the cylinder, a handle portion, lugs on said handle portion, bolts passing through said lugs said bolts having screw threads'for the reception of nuts on the rear end, fiat faces on the front end, hooked portions on the front end, similar flat faces and hooked portions formed on and in the cylinder wall permitting cooperation between the bolts and the cylinder whereby the back head and cylinder are secured rigidly relative to each other.

In testimony whereof I have, signed this specification.

rnauc s A, JIMERSON. 

